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Compression in material science, physics or structural engineering, is the stress state of materials where the volume tends to decrease (compaction).

Compression is the result of the subjection of a material to compressive stress.

There are some indications that astronomical observations of gamma-ray bursts are possibly due to compression of neutron stars.

In laboratories, compression of materials is achieved by the use of press machines to measure the mechanical properties of materials such as compressive strength or the modulus of elasticity by experiments.

Topics: Physical Compression, Physical Quantity, Physical Constant...

Physical quantityA physical quantity is the result of measurement and usually expressed as the product of a numerical value and a physical unit (whereby SI units are usually preferred). Example : P 42. 3 x 103 W 42. 3 kW where P represents the physical quantity for power	Physical constantIn science, a physical constant is a physical quantity whose numerical value does not change. It can be contrasted with a mathematical constant, which is a fixed value that does not directly involve a physical measurement. There are many physical constant	PhysicalismSee also the old text of this article Physicalism/Larry's text. Physicalism is the metaphysical position that everything is physical; that is, that there are no kinds of things other than physical things. Likewise, physicalism about the mental is a positi
Physical eventPhysical events are events that occur in the physical world, including the brain and other parts of the human body. Something that happens in the brain is a physical event. These are to be distinguished from mental events. A comment : an event is an act o	Physical chemistryPhysical chemistry is the study of the physical basis of chemical systems and processes. Modern physical chemistry is firmly grounded upon physics. Important areas of study include chemical thermodynamics, chemical kinetics, quantum chemistry, statistical	Physical sciencePhysical science is the branch of science including chemistry and physics, and sometimes contrasted with natural or biological science. Physical science includes the sub-branches of aerodynamics, astronomy and astrophysics, classical mechanics, civil engi
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